While other actors in the Marvel Cinematic Universe have expressed their desire to end their run, Chris Hemsworth spoke to The Morning Show in Australia about his role as Thor.
"It's three times I've played the character now; [which] has made me look at it in a different way. We just shot the Avengers [sequel] and finished a couple months ago. It's exciting if not more than the first one was to see all those characters come back together.
I still got three more [movies] in my contract that I need to finish off, but I love playing the character. So, I'm not in any hurry to finish doing that. It's nice to be able to fit different things in between [playing Thor.]"
I'm assuming when Hemsworth says 'three times I've played the character now', he means the movies that has been released and Age of Ultron will be fourth when it's released next year.
(Source: Dark Horizons)